The prediction of the amount of salt sediment in the electrolytesolutions with the extended equation of states based on PengRobinson equation of state

The solubility of several salt in different electrolyte solutions is modeled by using the proposed equation ofstate. The modified Peng-Robinson equation of state, Born and MSA terms, were used at this model. To dothis modeling, a large number of experimental data has been collected for electrolyte systems. At thismodeling, optimization based on salt has used and van der Waals attraction parameter, van der Waalsexcluded-volume parameter, ion diameter and binary interaction parameter between the molecule-salt havebeen optimized by fitting experimental data of liquid density and average mean ionic activity coefficientsover wide range of temperatures. The Average relative deviation for prediction of salt solubility in theelectrolyte solutions, for potassium dichromate solution, potassium chlorate solution, potassium nitratesolution, ammonium chloride solution, sodium sulfate solution, potassium iodide solution, sodium nitratesolution, potassium sulfate solution is obtained ۲.۲۳% ,۱.۱۶% ,۱.۲۸% ,۱.۹۳ %, ۱.۳۴ %, ۲.۲۸%, ۲.۵۷%, ۱.۰۳%respectively. The solubility of three-component systems were also predicted with good accuracy. Thesolubility of salts in ternary systems was also predicted with high accuracy. The results showed that thismodel could predict solid-liquid equilibrium behavior over a wide range of temperature and pressure.

کلیدواژه ها:

Electrolyte solutions ، Equation of states ، Peng Robinson ، Salt sediment ، Salt Sediment ، Solidliquidequilibrium.